Machine for bending pipe



(No Model.

*- J. M. EVARTS.

MAGHINBFOE BENDING PIPE.

No. 275,029. Patented Apr. 3, 1883.

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UNITED STATES PATENT OFFICE.

JAMES M. EVARTS, OF NEW HAVEN, CONNECTICUT.

MACHINE FOR BENDING PIPE.

SPECIFICATION forming part of Letters Patent No. 275,029, dated April 3, 1883.

Application filed December 1, 1882.

T 0 all whom it may concern:

Be it known that I, JAMES M. EVARTS, a citizen of the United States of America, residing at New Haven, in the county of New Haven and State of Connecticut, have invented certain new and useful Improvements in Pipe-Bending Machines, of which the following is a specification, reference being bad therein to the accompanying drawings, in which-- Figure 1. is a side elevation of the machine. Fig. 2 is aplan view, and Figs. 3, 4, and 5 are views of parts of the machine.

My invention relates to machines for bending pipes or tubes into coils; and the invention consists in a combination of rolls for the the purpose, and in the general construction and combination of the several parts of the machine.

To enable others skilled in the art to understand my machine and its operation, I will give a detailed description of both.

A is the frame of the machine, which is cast in one piece, and has the oblong openings a, in which the boxes I) are placed. The finegrooved rolls a, m, n, 0, and p are similar rolls, and the grooves in them are a little less than a semicircle, so that the rolls will tightly clamp the pipe or tube to be bent and not come in contact with each other. They are securely fastened on the shafts c,'which turn in the boxes I). The two lower boxes rest on the bottom of the oblongopenings in the frame. The three upper boxes are adjustable, and may be raised or lowered by the threaded bolts (1, which turn in threaded holes in the frame A, and are attached to the boxes.

The piece D, Fig. 3, is made with a roller, and its threaded part passes through a hole in the frame. The nuts shown on its threaded part allow the part with the roller to be adjusted at the desired distance from a vertical plane passing through the rolls. The function of this piece is to spread the rings of the coil to the desired distance. The position shown by the'dotted lines is its position when in use.

The piece E, Figs. 1 and at, loosely tits on the circular part of the nut s, Fig. 5, which is (No model.)

threaded and screws onto the threaded end of the shaft to which the roll a is fastened. By means of the not it may he clamped to the roll and made to turn with it. One end of the piece is bent in the form shown, the inside of the bend being semicircular. It is used to make short bends of pipe by turning it up over the end of the pipe and fastening it by the not as the pipe is passed through the rolls m and n. It is only adapted to make bends less than a semicircle about the roll n. It is not used in bending coils, and is not an indispensa ble part of the machine.

Thepulley Aand the pinion a, which meshes in the wheel 13, are connected together and turn on a stud in the frame A. The wheel B is connected to the pinion b, which meshes in the wheel 0, and also turns on a stud in the frame. The wheel 0 and the smaller gearwheel 0' are fastened on the same shaft with the roll a. The small wheel 0 meshes into the wheeld, which is of the same size, has the same number of teeth, and is fastened on the same shalt with the roller m.

In bending pipe of ordinary size the roll 19 is not needed; but it is obvious that the shafts carrying the rolls 0 and 1 may have gearwheels, which may be connected to the train of wheels and pinions described. They would thus become feed-wheels like the wheels at and a, and might be useful in bending pipe of large size. 111 machines for bending pipe of ordinary size, in which the roll 1) is not needed, it is also obvious that the oblong opening in the frame may have the same inclination as the opening on the other end of the frame, and the top of the frame be made alike at both ends.

The several parts of the machine being constructed and arranged as above described, its operation is as follows: The adjustment of the roll an determines the size of the coil and the adjustment of the piece D the spread of the rings of the coil. The pipe is passed between the rolls m and n and under the roll 0, and, as the machine moves it forward, it passes under the roll as and over the roller on the piece I).

Having fully described my improved machine and its operation, what I claim as new, and desire to secure by Letters Patent, is-

1. The herein-described pipe-bending lnaoperated as described,in combination with the chine, consisting essentially of the frame A, adjustable piece D, to form a coil of pipe as ofthe rolls 00, m, n, and 0, of the pulley A, and set forth. of the train of wheels and pinions described, In testimony whereof I affix my signature in all the said parts constructed and combined presence of two witnesses.

substantially as shown and set forth. r

2. The rolls w, m, n, and 0, arranged and JAMES ARTS operated as described, in combination, for bend- Witnesses: ing pipe, as set forth. GEORGE TERRY, 1o 3. The rolls 00, m, n, and 0, arranged and JOSEPH H. GREENLEAF. 

